參數(shù)資料
型號(hào)： MB3893APFV
廠商： FUJITSU LTD
元件分類： 電源管理
英文描述： Bridge Rectifier; Current Rating:260A; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes
中文描述： 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQFP48
封裝： PLASTIC, LQFP-48
文件頁(yè)數(shù)： 26/44頁(yè)
文件大?。?/td> 496K
代理商： MB3893APFV
MB3893A
26
I
SETTING THE XON DELAY TIME
When the XON terminal (pin 11) voltage changes from “H” to “L” level, the VCONT signal (pin 16) rises. The
time constant of the capacitor (C
RC1
) and resistor (R
RC1
) connected to the RC1 terminal (pin 15) determine the
delay time before the rise of the VCONT signal (pin 16).
XON delay time : t
XON
(ms) : 598.3
×
C
RC1
(
μ
F)
I
SETTING THE XRST DELAY TIME
The time constant of the capacitor (C
C1
) connected to the C1 terminal (pin 7) determines the delay time between
the rise of the OUT1 terminal (pin 29) voltage above 2.3 V (Typ.) and the rise of the XRST terminal (pin 35) voltage.
I
SETTING THE POWER SUPPLY DROP DETECTION TIME
When the VCC terminal (pin 40) voltage falls below 2.0 V (Typ.) the CR1 terminal (pin 12) and CR2 terminal (pin
13) are opened, and the capacitors (C
CR1
, C
CR2
) connected to the CR1 and CR2 terminals are discharged through
the respective resistors (R
CR1
, R
CR2
). The discharge time (cutoff detection time) of the CR1 and CR2 pins can
be set according to the time constants of the capacitors and resistors connected to the CR1 and CR2 terminals
respectively, between 0.89 V (Typ.) to 0.51 V (Typ.).
Cutoff detection time : t
DET1
(s) :
C
CR1
(
μ
F)
×
R
CR1
(M
)
×
ln (0.51 (V) /0.89 (V) )
t
DET2
(s) :
C
CR2
(
μ
F)
×
R
CR2
(M
)
×
ln (0.51 (V) /0.89 (V) )
I
BATTERY TEMPERATURE DETECTION
The battery temperature sensor uses the thermistor shown below. The thermistor temperature coefficient is set
by the following formula.
Thermistor temperature coefficient : B
=
lnR1
lnR2
1
/
T1
1
/
T2
XRST delay time : t
POR
(s) : 1.23 (V)
×
C
C1
(
μ
F)
1.45 (
μ
A)
VREFTH
TSENSE
10 k
T1 : 276 (K)
=
3 (
°
C)
R1 : 23.27 (k
)
T2 : 321 (K)
=
48 (
°
C)
R2 : 4.026 (k
)
=
3454 (K)
Thermistor
B
=
3454 (K)
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